60GHz无线通信系统中载波同步与相位噪声抑制

发布时间：2019-01-07 11:10

【摘要】：随着社会的发展,人们对信息传输速率的要求也越来越高。60GHz频带由于拥有巨大的带宽,其信息传输速率可达数Gbps。但是,处于高频段的60GHz无线通信系统与低频段无线通信系统相比,其射频前端会产生更为严重的相位噪声。同时,高相位噪声也会影响到60GHz无线通信系统的载波同步,因此载波同步也是60GHz无线通信系统中的难点。由于本文研究的载波同步与相位噪声补偿抑制算法需要在硬件中实现,这就需要该算法复杂度要低。本文基于IEEE-802.11ad标准并结合60GHz项目实际情况,提出了能够同时解决载波同步和补偿抑制相位噪声的低复杂度算法,并且得到了60GHz实际系统的验证。本文的结构如下:本文首先对60GHz无线通信系统进行概述。概述的主要内容有:60GHz无线信道,IEEE-802.11ad标准中的帧结构,相位噪声模型与LDPC纠错码。接着介绍了各种载波同步算法,由于受到高相位噪声的影响,在实际的60GHz系统中,最常用的科斯塔斯环不能进行载波同步。这时本文结合60GHz实际系统,提出了基于相位纠正的低复杂度数据辅助载波同步算法。然后经过分析,假设如下:载波不同步与相位噪声对通信系统的影响表现形式为引起数据相位的偏移,通过基于相位纠正的低复杂度数据辅助载波同步算法对数据的相位偏移进行纠正,就能够同时达到载波同步和对相位噪声进行补偿抑制目的。最后简要的介绍各种相位噪声补偿抑制的算法,然后经过分析,基于相位纠正的数据辅助载波同步算法,可同时用来纠正相位噪声带来的相位偏移。然后用系统基带FPGA上导出来的数据,验证了上述算法,该算法在60GHz实际系统中取得了良好的效果。
[Abstract]:With the development of society, the demand of information transmission rate is higher and higher. Because 60GHz frequency band has a huge bandwidth, its information transmission rate can reach a number of Gbps.. However, the RF front-end of 60GHz wireless communication system in high frequency band will produce more serious phase noise than that of low-frequency wireless communication system. At the same time, high phase noise will affect the carrier synchronization of 60GHz wireless communication system, so carrier synchronization is also a difficult problem in 60GHz wireless communication system. Since the carrier synchronization and phase noise compensation algorithms studied in this paper need to be implemented in hardware, the complexity of the algorithm is low. Based on the IEEE-802.11ad standard and the actual situation of the 60GHz project, this paper presents a low complexity algorithm which can simultaneously solve the carrier synchronization and compensate for the phase noise, and is verified by the 60GHz system. The structure of this paper is as follows: firstly, this paper gives an overview of 60GHz wireless communication system. The main contents are as follows: 60GHz wireless channel frame structure in IEEE-802.11ad standard phase noise model and LDPC error-correcting code. Then various carrier synchronization algorithms are introduced. Due to the influence of high phase noise, the most commonly used Kostas loop can not synchronize the carriers in practical 60GHz systems. In this paper, a low complexity data-aided carrier synchronization algorithm based on phase correction is proposed based on 60GHz system. Then, after analysis, it is assumed that the influence of carrier unsynchronization and phase noise on the communication system is in the form of data phase offset. The phase offset of data can be corrected by a low complexity data-aided carrier synchronization algorithm based on phase correction, which can simultaneously achieve the purpose of carrier synchronization and phase noise compensation and suppression. Finally, this paper briefly introduces various phase noise compensation and suppression algorithms, and then analyzes that the data-aided carrier synchronization algorithm based on phase correction can be used to correct the phase offset caused by phase noise at the same time. Then the above algorithm is verified by the data generated from the baseband FPGA of the system. The algorithm has achieved good results in the actual 60GHz system.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN92

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